Top Posters
Since Sunday
g
3
3
2
J
2
p
2
m
2
h
2
s
2
r
2
d
2
l
2
a
2
Home Q & A Board Science-Related Homework Help Physics
New Topic  
linn.tuell linn.tuell
wrote...
Go to Answer
Posts: 42
Rep: 1 0
10 years ago
1. A distance R away from a light source we observe which of the following for the electromagnetic field it produces?
A. The light intensity drops as 1/R^2, but the magnitude of the electric field drops as 1/R.
B. The light intensity drops as 1/R, but the magnitude of the electric field drops as 1/R^2.
C. Both the light intensity and the magnitude of the electric field drop as 1/R.
D. Both the light intensity and the electric magnitude of the electric field drop as 1/R^2.
E. None of the previous answers are correct.

2. In Fizeau's experiment for measuring the speed of light, the wheel has 475 notches. What rotational speed is required for the return beam of light to pass through the next notch? The time between successive notches is 6.65 x 10^-5 s.
A. 66.4 rev/sec
B. 90.9 rev/sec
C. 16.6 rev/sec
D. 20.4 rev/sec
E. 31.7 rev/sec
Read 436 times
2 Replies
Replies
wrote...
#1
Staff Member
Educator
10 years ago
Quote from: linn.tuell (10 years ago)
1. A distance R away from a light source we observe which of the following for the electromagnetic field it produces?
A. The light intensity drops as 1/R^2, but the magnitude of the electric field drops as 1/R.
B. The light intensity drops as 1/R, but the magnitude of the electric field drops as 1/R^2.
C. Both the light intensity and the magnitude of the electric field drop as 1/R.
D. Both the light intensity and the electric magnitude of the electric field drop as 1/R^2.
E. None of the previous answers are correct.

Both the light intensity and the magnitude of the electric field drop as 1/R^2^
Mastering in Nutritional Biology
Tralalalala Slight Smile
Answer accepted by topic starter
padrepadre
wrote...
#2
Staff Member
Educator
Top Poster
Posts: 21608
Rep: 4541 17
10 years ago
Sign in or Sign up in seconds to unlock everything for free
1
Mastering in Nutritional Biology
Tralalalala Slight Smile

Related Topics
New Topic      
Quick Reply
Explore
Post your homework questions and get free online help from our incredible volunteers
  883 People Browsing
 188 Signed Up Today
Start New Topic Take the Tour CoursesNew Study Tools Topics Trending Browse by Textbook
Live Chat
Related Images
  
 125
  
 484
  
 7830
Your Opinion
Who will win the 2024 president election?
Votes: 3
Closes: November 4
Previous poll results: Which of the following is the best resource to supplement your studies: